Abstract
Determination of hydrographic characteristics on large-scale maps with maximum accuracy requires sufficient time and volume of cartometric work. The current level of geographic information systems (GIS) and computer technologies allows to reduce the volume of cartometric operations. The implementation of calculations of the morphometric characteristics of watercourses, reservoirs, and watersheds in the GIS environment ensures the determination of these properties regardless of the scale of maps, map projection, or distance from the axial meridian of a particular projection zone. This article demonstrates the use of analytical and numerical methods for cartometric and morphometric calculations on the reference ellipsoid. The researched calculation methods determine the geodetic areas of geospatial objects with root mean square errors from 0,030 to 0,809 m2.
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